Public bug reported:
Any attempt to use snapper during a btrfs quota rescan causes snapperd
to write a single line 200000 times per second to /var/log/snapperd.log
The line:
"2025-01-03 12:10:19 WAR libsnapper(99648) BtrfsUtils.cc(quota_rescan):474 -
waiting for old quota rescan to finish"
grep "2025-01-03 12:10:20 WAR libsnapper(99648) BtrfsUtils.cc(quota_rescan):474
- waiting for old quota rescan to finish" snapper.log | wc
207935 2703155 23912525
This needlessly consumes CPU, disk space (24MB/s or 86GB7h), and wears
the SSD.
BTRFS running a quota scan:
# btrfs quota rescan -s /
rescan operation running (current key 233828753409)
# lsb_release -rd
No LSB modules are available.
Description: Ubuntu 24.04.1 LTS
Release: 24.04
# apt-cache policy snapper
snapper:
Installed: 0.10.6-1.1build1
Candidate: 0.10.6-1.1build1
Version table:
*** 0.10.6-1.1build1 500
500 https://mirrors.ptisp.pt/ubuntu noble/universe amd64 Packages
100 /var/lib/dpkg/status
** Affects: snapper (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2092965
Title:
snapperd loops while btrfs runs quota rescan
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